Recent Accounting Pronouncements - Schedule of the Impact of Adoption on Statements of Operations and Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Mar. 31, 2018
Assets:
Receivables, net of allowance for doubtful accounts	$ 535	$ 354
Deferred contract costs	49	21
Other assets	199	21
Liabilities and Stockholders’ Equity
Accrued expenses and other current liabilities	508	180
Non-current deferred tax liabilities	125	176
Total stockholders’ equity	2,203	$ 2,729
Balances Without Adoption of ASC 606
Assets:
Receivables, net of allowance for doubtful accounts	529
Deferred contract costs	47
Other assets	192
Liabilities and Stockholders’ Equity
Accrued expenses and other current liabilities	502
Non-current deferred tax liabilities	122
Total stockholders’ equity	2,197
ASU 2014-09 | Effect of Change Higher/(Lower)
Assets:
Receivables, net of allowance for doubtful accounts	6
Deferred contract costs	2
Other assets	7
Liabilities and Stockholders’ Equity
Accrued expenses and other current liabilities	6
Non-current deferred tax liabilities	3
Total stockholders’ equity	$ 6